Rear suspension system for cross-country racing car

Abstract

The utility model relates to the technical field of racing cars, in particular to a rear suspension system for a cross-country racing car, which comprises a rear axle and a rear wheel core fixed at the end part of the rear axle, a universal joint is fixedly arranged at one end of the rear axle, a rear cleat is mounted in the middle of the rear axle, the rear axle can rotate relative to the rear cleat, and a rear wheel core is fixed at the other end of the rear axle. The rear claw is connected with a frame of the racing car through the trailing arm; a fish eye ball head is arranged at the front end of the trailing arm, the fish eye ball head of the trailing arm is hinged to a frame of the racing car, and the rear end of the trailing arm is fixed to a rear horn. An upper fixing part and a lower fixing part are arranged on the rear claw, and the upper fixing part is connected with a frame of the racing car through an upper pull rod; the lower fixing part is connected with a frame of the racing car through a lower pull rod. The rear suspension system for the cross-country racing vehicle facilitates inward inclination or outward inclination of wheels and adjustment of toe-in angles of the wheels, and has the advantages of being compact in structure, light in weight, convenient to operate, high in safety during vehicle running and the like.

Description

Technical Field

[0001] This invention relates to the field of racing technology, and more particularly to an off-road rally car. Background Technology

[0002] The BAJA (Baja in China) racing series originated in the United States and is the predecessor to the Formula Student Grand Prix. The BAJA requires participating teams to undergo a variety of static and dynamic tests. These dynamic tests include traction testing, hill climbing, straight-line acceleration testing, and endurance testing. The competition places stringent demands on the car's power, handling stability, and braking performance, while also requiring good endurance. Therefore, the cars need high strength, low weight, and good dynamic response to complete all aspects of the competition.

[0003] Traditional racing cars primarily use steel components, resulting in robust structures and significant weight. However, due to cost and other factors, the overall powertrain and transmission systems often suffer from inefficient layouts, insufficient compactness, and inadequate safety design. This leads to large vehicle dimensions, excessive material usage, heavy weight, poor acceleration, limited off-road capability, and inadequate safety features. Therefore, it is necessary to optimize automotive components from both material and structural perspectives to reduce vehicle weight and improve performance.

[0004] The vertical mounting angle and toe angle of a racing car wheel are crucial during driving. Existing technologies suffer from drawbacks such as inconvenient installation and adjustment. Utility Model Content

[0005] The technical problem to be solved by the present invention is to provide a rear suspension system for off-road rally cars that addresses the above-mentioned shortcomings. This system facilitates the adjustment of the vertical mounting angle of the race car wheels and the sign and magnitude of the wheel toe angle, enabling the adjustment of wheel camber or slant and toe angle. It has the advantages of compact structure, light weight, convenient operation, and high vehicle safety.

[0006] To solve the above problems, the technical solution adopted by the present invention is as follows:

[0007] A rear suspension system for off-road rally cars includes a horizontally arranged rear axle and a rear wheel hub fixed to the end of the rear axle; a universal joint is fixed to one end of the rear axle, a rear steering knuckle is installed in the middle of the rear axle, the rear axle can rotate relative to the rear steering knuckle, and the rear wheel hub is fixed to the other end of the rear axle.

[0008] As an improvement, the rear steering knuckle is connected to the car frame via a trailing arm; the front end of the trailing arm is provided with a spherical head, which is hinged to the car frame, and the rear end of the trailing arm is fixed to the rear steering knuckle.

[0009] As an improvement, the upper end of the rear horn is provided with an upper fixing part and the lower end is provided with a lower fixing part. The upper fixing part is connected to the car frame of the race car through an upper pull rod; the lower fixing part is connected to the car frame of the race car through a lower pull rod.

[0010] As an improvement, both ends of the upper and lower pull rods are provided with spherical heads; the spherical heads at both ends of the upper pull rod are threaded to the upper pull rod, and the threads of the two spherical heads on the upper pull rod are in opposite directions; the spherical head at one end of the upper pull rod is hinged to the upper fixed part, and the spherical head at the other end is hinged to the frame.

[0011] As an improvement, the spherical heads at both ends of the pull rod are threaded to the pull rod, and the threads of the two spherical heads on the pull rod are in opposite directions; the spherical head at one end of the pull rod is hinged to the lower fixed part, and the spherical head at the other end is hinged to the car frame of the race car.

[0012] As an improvement, the rear wheel axle has a splined section and a threaded section at its end, a splined hole in the middle of the rear wheel core, the splined hole of the rear wheel core is fitted onto the splined section of the rear wheel axle, and a fastening nut is installed on the threaded section of the rear wheel axle.

[0013] As an improvement, the rear steering knuckle is fitted in the middle of the rear wheel axle, and a bearing is provided between the rear steering knuckle and the rear wheel axle.

[0014] As an improvement, the universal joint is connected to the drive shaft of the race car via a third drive shaft; one end of the third drive shaft is connected to the universal joint ball joint, and the other end is connected to the drive shaft ball joint of the vehicle.

[0015] As an improvement, the rear wheel core is a cross-shaped plate structure with a concave center; the concave part in the middle of the rear wheel core forms a clearance area.

[0016] The present invention adopts the above technical solution and has the following advantages compared with the prior art:

[0017] The rear suspension system for off-road rally cars in this technical solution allows for easy adjustment of the vertical mounting angle of the race car wheels and the sign and magnitude of the wheel toe angle, enabling adjustment of wheel camber or slouch and toe angle. It has advantages such as compact structure, light weight, easy operation, and high vehicle safety.

[0018] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0019] Figure 1 Schematic diagram of the rear suspension system for off-road rally cars Figure 1 ;

[0020] Figure 2 Schematic diagram of the rear suspension system for off-road rally cars Figure 2 ;

[0021] Figure 3 for Figure 1 CC section view;

[0022] Figure 4 A reference diagram showing the usage status of a rear suspension system for off-road rally cars;

[0023] Wherein: 4-wheel, 28-upper fixed part, 29-lower fixed part, 45-rear steering knuckle, 46-rear wheel axle, 47-rear wheel core, 48-avoidance area, 49-universal joint, 50-third drive shaft, 56-drive shaft, 63-upper tie rod, 64-lower tie rod, 65-spherical head, 66-trailer arm. Detailed Implementation

[0024] For ease of explanation rather than limitation, when using terminology in off-road rally racing, the direction to the driver's left is defined as left, and the direction to the driver's right is defined as right; the direction in front of the driver is defined as forward, and the direction behind the driver is defined as backward, as well as the derived terms up and down. The position closest to the center of the off-road rally car is defined as inside, and the opposite direction is defined as outside.

[0025] Example

[0026] like Figure 1 , Figure 2 and Figure 3 As shown, a rear suspension system for an off-road rally car also includes a horizontally arranged rear axle 46 and a rear wheel hub 47 fixed to the end of the rear axle 46, as well as a rear steering knuckle 45 located inside the wheel 4; the rear wheel hub 47 is fixedly connected to the wheel 4. A universal joint 49 is fixedly provided at one end of the rear axle 46, the rear steering knuckle 45 is rotatably mounted in the middle of the rear axle 46, and the rear wheel hub 47 is fixed at the other end of the rear axle 46. Specifically, the rear steering knuckle 45 is fitted into the middle of the rear axle 46, and a bearing is provided between the rear steering knuckle 45 and the rear axle 46. The end of the rear axle 46 is sequentially provided with a splined section and a threaded section, the middle of the rear wheel hub 47 is provided with a splined hole, the splined hole of the rear wheel hub 47 is fitted onto the splined section of the rear axle 46, and a fastening nut is installed on the threaded section of the rear axle 46. The fastening nut secures the rear wheel core 47 to the rear wheel axle 46 from one end, thus achieving axial fixation of the rear wheel core 47 on the rear wheel axle 46.

[0027] Universal joint 49 is connected to the drive shaft 56 of the race car via a third drive shaft 50. One end of the third drive shaft 50 is ball-jointed to universal joint 49, and the other end is ball-jointed to drive shaft 56. Preferably, in this embodiment, universal joint 49 is a ball-cage type universal joint.

[0028] In this preferred embodiment, the rear wheel hub 47 is a cross-shaped plate structure with a concave center, made of 20CrMoTi alloy steel. The concave portion in the middle of the rear wheel hub 47 forms a clearance area 48, which provides a space for the fastening nut at the end of the rear wheel axle 46, preventing interference between the fastening nut and the wheel 4. Furthermore, this structure is compact and the components are lightweight. This design reduces the weight of the rear wheel hub 47 by 300 grams compared to existing rear wheel hub structures.

[0029] like Figure 1 , Figure 2 and Figure 3 As shown, the upper end of the rear steering knuckle 45 is provided with an upper fixing part 28, and the lower end is provided with a lower fixing part 29. The upper fixing part 28 is connected to the chassis of the race car via an upper pull rod 63. The lower fixing part 29 is connected to the chassis of the race car via a lower pull rod 64. Specifically, both ends of the upper pull rod 63 and the lower pull rod 64 are provided with spherical heads 65. The spherical heads 65 at both ends of the upper pull rod 63 are threadedly connected to the upper pull rod 63, and the threads of the two spherical heads 65 on the upper pull rod 63 are turned in opposite directions. The spherical heads 65 at both ends of the lower pull rod 64 are threadedly connected to the lower pull rod 64, and the threads of the two spherical heads 65 on the lower pull rod 64 are turned in opposite directions. In use, rotating the middle part of the upper pull rod 63 can adjust the length of the upper pull rod 63; rotating the middle part of the lower pull rod 64 can adjust the length of the lower pull rod 64. The length adjustment range of a single spherical head 65 is 5-6 mm. One end of the upper tie rod 63 has a ball joint 65 hinged to the upper fixed part 28, and the other end has a ball joint 65 hinged to the frame 1. One end of the lower tie rod 64 has a ball joint 65 hinged to the lower fixed part 29, and the other end has a ball joint 65 hinged to the race car frame. During the assembly and debugging of the off-road rally car, by adjusting the length of the upper tie rod 63 and / or the lower tie rod 64, the rear steering knuckle 45 can swing in the vertical plane, thereby adjusting the angle between the rear steering knuckle 45 and the vertical direction, and thus adjusting the vertical angle of the wheel 4 mounted on it, achieving the adjustment of wheel camber or slack.

[0030] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, a trailing arm 66 is provided between the rear steering knuckle 45 and the frame 1. The front end of the trailing arm 66 is provided with a ball joint 65, which is hinged to the frame of the race car. The rear end of the trailing arm 66 is fixed to the rear steering knuckle 45. During the assembly and debugging of the off-road rally car, the length of the trailing arm 66 can be adjusted through the ball joint 65, thereby adjusting the positive and negative and large toe angle of the trailing wheel 4.

[0031] The present invention provides a rear suspension system for off-road rally cars, which facilitates the adjustment of the vertical mounting angle of the race car wheels and the sign and size of the wheel toe angle, realizing the adjustment of wheel camber or slant and toe angle. It has the advantages of compact structure, light weight, convenient operation, and high safety when the vehicle is in motion.

[0032] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A rear suspension system for off-road rally cars, characterized in that: It includes a horizontally arranged rear wheel axle (46) and a rear wheel core (47) fixed to the end of the rear wheel axle (46); a universal joint (49) is fixed at one end of the rear wheel axle (46), a rear steering knuckle (45) is installed in the middle of the rear wheel axle (46), the rear wheel axle (46) can rotate relative to the rear steering knuckle (45), and the rear wheel core (47) is fixed at the other end of the rear wheel axle (46). The rear horn (45) has an upper fixing part (28) at the upper end and a lower fixing part (29) at the lower end. The upper fixing part (28) is connected to the car frame of the race car through an upper pull rod (63); the lower fixing part (29) is connected to the car frame of the race car through a lower pull rod (64); the lengths of the upper pull rod (63) and the lower pull rod (64) are adjustable. The rear wheel core (47) is a cross-shaped plate structure with a concave center; the concave part in the middle of the rear wheel core (47) forms a clearance area (48).

2. The rear suspension system for off-road rally cars as described in claim 1, characterized in that: The rear saddle (45) is connected to the car frame via a trailing arm (66); the front end of the trailing arm (66) is provided with a fisheye head (65), the fisheye head (65) of the trailing arm (66) is hinged to the car frame, and the rear end of the trailing arm (66) is fixed to the rear saddle (45).

3. The rear suspension system for off-road rally cars as described in claim 1, characterized in that: Both ends of the upper pull rod (63) and the lower pull rod (64) are provided with fisheye heads (65); the fisheye heads (65) at both ends of the upper pull rod (63) are threadedly connected to the upper pull rod (63), and the threads of the two fisheye heads (65) on the upper pull rod (63) are opposite in direction; the fisheye head (65) at one end of the upper pull rod (63) is hinged to the upper fixing part (28), and the fisheye head (65) at the other end is hinged to the frame (1).

4. The rear suspension system for off-road rally cars as described in claim 3, characterized in that: The fisheye heads (65) at both ends of the pull rod (64) are threaded to the pull rod (64), and the threads of the two fisheye heads (65) on the pull rod (64) are in opposite directions; the fisheye head (65) at one end of the pull rod (64) is hinged to the lower fixed part (29), and the fisheye head (65) at the other end is hinged to the car frame of the race car.

5. The rear suspension system for off-road rally cars as described in any one of claims 1 to 4, characterized in that: The rear wheel axle (46) has a spline section and a threaded section at its end, and a spline hole is provided in the middle of the rear wheel core (47). The spline hole of the rear wheel core (47) is fitted onto the spline section of the rear wheel axle (46), and a fastening nut is installed on the threaded section of the rear wheel axle (46).

6. The rear suspension system for off-road rally cars as described in any one of claims 1 to 4, characterized in that: The rear steering knuckle (45) is fitted onto the middle of the rear wheel axle (46), and a bearing is provided between the rear steering knuckle (45) and the rear wheel axle (46).

7. The rear suspension system for off-road rally cars as described in any one of claims 1 to 4, characterized in that: The universal joint (49) is connected to the drive shaft (56) of the race car via a third drive shaft (50); one end of the third drive shaft (50) is ball-connected to the universal joint (49), and the other end is ball-connected to the drive shaft of the vehicle.

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